Number System<title> <script> function convert_base(){ var num, convert_from, convert_to, final_result, result; num=document.getElementById("conv_num").value; convert_from=document.getElementById("base_from").value; convert_to=document.getElementById("base_to").value; if (validate(num,convert_from)){ if (convert_to == 10){ final_result=to_base_ten(num,convert_from); document.getElementById("base_result").innerHTML=final_result; }else if (convert_from == 10){ from_base_ten(num,convert_to); }else { final_result=to_base_ten(num,convert_from); from_base_ten(final_result,convert_to); } } } function from_base_ten(num,convert_to){ var result; var mod_arr=new Array() var div=0, i=0, j; do{ div=Math.floor(num/convert_to); mod_arr[i]=parseInt(num%convert_to); num=div; i=i+1; }while(div>=convert_to); if (div != 0) mod_arr[i]=div; document.getElementById("base_result").innerHTML="" for(i; i>=0; i--){ document.getElementById("base_result").innerHTML+= mod_arr[i]; } } function to_base_ten(num,convert_from){ var len=num.length; var result=0; var i, tmp, bsPow; for (i=0;i<len;i++) { tmp=num.charAt((len-i)-1); bsPow=Math.pow(convert_from,i) result += parseInt(parseInt(tmp) * parseInt(bsPow)) } return result; } function validate(num,convert_from){ if(num==null || num==""){ alert("Please Enter Number"); document.getElementById("conv_num").select(); return false; }else if (isNaN(num)){ alert("Please Type Digit"); document.getElementById("conv_num").select(); return false; }else if(!check_num(num,convert_from)){ return false; }else { return true; } } function check_num(num,convert_from){ var baseNum=new Array("","","01","012","0123","01234","012345","0123456","01234567","012345678","0123456789"); var len=num.length; var tf=true; var i; for (i=0;i<len;i++){ if (parseInt(num.charAt(i)) >= parseInt(convert_from)) { tf=false; }else if (validateInteger(num)) { tf=false; } if (tf==false){ alert("Illegal number of a base "+ convert_from + "\n" + "only these symbols are allowed " + baseNum[convert_from]); document.getElementById("conv_num").select(); return false; }else { return true; } } } function validateInteger( strValue ) { var objRegExp = /[-+.]/; //check for integer characters return objRegExp.test(strValue); } </script> <style> body{ background:#dfdfdf; } #main{ margin:0 auto; width:410px; padding:20px; background:#c1c1c1; } #base_result{ height:45px; padding-top:10px; font-size:24px; text-align:center; background:#fff; } h1{ text-align:center; font-size:20px; } </style> </head> <body> <h1>Converter for Different Numeral Systems</h1> <div id="main"> <input type="text" id="conv_num"> <select id="base_from"> <option value="2">Base 2</option> <option value="3">Base 3</option> <option value="4">Base 4</option> <option value="5">Base 5</option> <option value="6">Base 6</option> <option value="7">Base 7</option> <option value="8">Base 8</option> <option value="9">Base 9</option> <option value="10">Base 10</option> </select> To <select id="base_to"> <option value="2">Base 2</option> <option value="3">Base 3</option> <option value="4">Base 4</option> <option value="5">Base 5</option> <option value="6">Base 6</option> <option value="7">Base 7</option> <option value="8">Base 8</option> <option value="9">Base 9</option> <option value="10">Base 10</option> </select> <input type="button" value="submit" onclick="convert_base()"/> <div style="clear:both; height:20px;"></div> <div id="base